In general Christians have done a poor job of preaching the word, the whole word. It’s a reason why I love Ravi Zechariah.
Yes, Ravi is a high IQ Believer. So was Isaac Newton....maybe the highest IQ believer of all time, who actually wrote more words on Bible prophecy than he did on science (wrote a lot on that too). And Einstein too.
Maybe it’s the low information folks getting slightly higher IQs that deceive them.....many very high IQ folks are devout believers.